br: compatible with and add integration test for partial index

[Leavrth]

What problem does this PR solve?

Issue Number: ref #62664

Problem Summary:
To be compatible with partial index for repairing ingest index after log restore

What changed and how does it work?

recognize the IndexInfo.ConditionExprString

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

Hi @Leavrth. Thanks for your PR.

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[YangKeao]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.2628%. Comparing base (8c27816) to head (46d88aa).
⚠️ Report is 28 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #64434        +/-   ##
================================================
+ Coverage   72.6827%   75.2628%   +2.5801%     
================================================
  Files          1865       1867         +2     
  Lines        506065     513443      +7378     
================================================
+ Hits         367822     386432     +18610     
+ Misses       115852     103964     -11888     
- Partials      22391      23047       +656     

Flag	Coverage Δ
integration	45.8371% <100.0000%> (?)
unit	73.1189% <0.0000%> (+0.8638%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	63.6156% <100.0000%> (+17.4051%)	⬆️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, YangKeao

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Details

Needs approval from an approver in each of these files:

• br/OWNERS [3pointer]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-11-12 06:20:08.284925317 +0000 UTC m=+855857.727955196: ☑️ agreed by YangKeao.
• 2025-11-18 04:07:37.388822839 +0000 UTC m=+1366306.831852717: ☑️ agreed by 3pointer.

[BornChanger]

/retest

[tiprow]

@BornChanger: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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In response to this:

/retest

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[YangKeao]

/cherry-pick release-8.5-20260116-v8.5.5

[ti-chi-bot]

@YangKeao: new pull request created to branch release-8.5-20260116-v8.5.5: #65917.

Details

In response to this:

/cherry-pick release-8.5-20260116-v8.5.5

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #68829.